Time and Amplitude of Afterpulse Measured with a Large Size Photomultiplier Tube

TL;DR

This study measures the timing, amplitude, and rate of afterpulses in a large 10-inch photomultiplier tube, providing insights into their characteristics and dependencies relevant for neutrino detection experiments.

Contribution

It provides detailed measurements of afterpulse timing and amplitude in a large PMT, revealing correlations and dependencies useful for understanding afterpulse mechanisms.

Findings

Distinctive groups in afterpulse timing and amplitude

Dependencies of afterpulse on high voltage and main pulse amplitude

Data informing the general mechanism of afterpulses

Abstract

We have studied the afterpulse of a hemispherical photomultiplier tube for an upcoming reactor neutrino experiment. The timing, the amplitude, and the rate of the afterpulse for a 10 inch photomultiplier tube were measured with a 400 MHz FADC up to 16 \ms time window after the initial signal generated by an LED light pulse. The time and amplitude correlation of the afterpulse shows several distinctive groups. We describe the dependencies of the afterpulse on the applied high voltage and the amplitude of the main light pulse. The present data could shed light upon the general mechanism of the afterpulse.